Device for converting motion



(No Model.)

E. E. MILLER.

DEVICE FOR CONVERTING MOTION.

N0. 261.666. I Patented Aug.1, 1662.

2 :"fS H.- 6 E 3 :95:

. UNITED STATES EDGAR E. MILLER,

PATENT QEEICE.

0 CANTON, 01110.

DEVICE FOR CONVERTING MOTION.

SPECIFICATION forming part of Letters Patent No. 261,866, dated August1, 1882.

Application filed May 17, 1882.

To all whom it may concern:

Be it known that I, EDGAR E. MILLER, a citizen of the United States,residing at Ganton, Ohio, have invented new and usefulImprovemen ts inDevices for Converting Motion, of which the following is aspecification.

My invention relates to devices for interconverting reciprocatory androtary motion, andmore particularly to that form of mechanism for thispurpose commonly known as the Scotch yoke. As ordinarily constructed andused,this consists of a yoke interposed between and connecting twopistons in the same straight line, said yoke embracing a slot withparallel faces extended at right angles with the axes of the pistons,and a sliding box or roller constituting the bearing for the crank-pinarranged to reciprocate laterally between the slot-faces as guides.

The reciprocation of the piston is transmitted into the rotation of theshaft through the medium of the yoke, the sliding box or roller, and thecrank.

In practical operation this device issubject to certain disadvantages,among which are'the unequal wear upon the slot-faces of the yoke, due toinequality of pressure at different positions of the crank, theexcessive friction, (particularlyin the sliding-box device,) due to theabove-mentioned cause, and the tendency to lateral displacement out ofthe true plane of motion, which is greatly aggravated by lost motion inthe working parts. Besides this, in the device as thus ordinarilyconstructed, it is difficult and expensive to repair the wear of use.

The object of my invention is to remedy these and other disadvantages,and provide a mechanism for practical use which shall relieve theunequal wear referred to, lessen friction, and

consequentlyiucrease the available power, and also enable all lostmotion to be easily and effectually taken up. A

To these ends my invention consists in dispensing with the features of asliding box or roller moving upon parallel interior surfaces of theyoke, and substituting therefor a block or bearing for the wrist-pin ofthe crank, carried in or upon a rod which I term a traverserod,tarrangedto reciprocate horizontally in bearings arranged. upon the ends of theyoke.

(No model.)

For convenience of illustration I have shown in the drawings heretoattached a reciprocating steam-pump or boiler-feeder, to which myinvention is applied.

Figure lis a vertical elevation of the pump complete, with the partsconstituting myinvention partly shown and partly indicated by dottedlines; and Fig. 2 is a transverse longitudinal section of the yoke,shown detached, with the traverse-rod and box in position.

In the drawings, A, B, and O designate the steam-cylinder,water-cylinder, and connecting-frame, respectively, of the steam-pump towhich my invention is applied. The pump is of an ordinary type ofdirect-acting pumps in which a'fly-wheel is employed to securesteadiness of motion in the working parts.

The steam piston-rod aand the pum p-plunger b are connected in the samestraight line bya yoke, D, which may be cast or otherwise formed in anyconvenient shape. I do not limit myself to any particular form orconstruction of the yoke, as these may be varied in many ways withoutdeparting from the spirit of my invention. It being necessary, however,to provide a means of removing at will the traverse-rod hereinafterdescribed, I prefer to construct the yoke with a detachable end, 0,normally held to its position by set-screws or bolts 12 passing throughinto the ends of the yoke D. The part cis cast or formed with flanges orabutments 0 0 between whichthe ends of the yoke D rest and are securedas in sockets, by which construction any accidental displacement of theparts isprevented. The detachable end piece, 0, and the opposite shortend of the yoke are suitably provided for the bearings of thetraverse-rod, which consists substantially of a rod, 67, of convenientstrength, enlarged at the center into a block, 6, in which is arectangular opening to receive the brasses constituting the immediatebearings of the crank-wrist. These bearing-brasses are constructed inthe usual manner and require no detailed description.

A cap, 7r, secured to the block eby set-screws, holds the brasses inposition and enables any lost motion to" be taken up. proportioned andarranged to maintain the axis of the crank-pin fin the axial plane oftraverse-rod, the latter reciprocating longi- The parts are IOOtudinally in its hearings in the yoke as the crank-shaft rotates.

The hearings in the traverse-rod in the yoke may be constructed invarious ways. A simple depression in the sides of the yoke in which thetraverse-rod may rest in bearing-brasses of the ordinary construction,and be secured by a covering-cap held by set-screws, will in many casesanswer the purpose. In such case the yoke need not be constructed with adetachable end piece, as I have described. I prefer, however, toconstruct the bearings as shown in the drawings, but which I need notparticularly describe herein, as I intend making the same the subject ofa separate application for Letters Patent, and therefore do not claimsuch construction herein.

The operation of the device is somewhat similar to that of the Scotchyoke. As the and preserves the proper alignment of parts perfectly.

The traverse-rod also possesses the function of an equalizing-bar, anddistributes the strains due to unequal pressure at different parts ofthe stroke equally upon the hearings of the rod. This reduces thefriction materially and renders it a simple and inexpensive matter totake up any lost motion due to wear.

It will also be observed that this construction makes practically auniversal joint in respect to the crank-pin connection, whereby thecrank-pin bearing is enabled to accommodate itself to an imperfectalignment of the flywheel shafts.

Having described my invention, I claim and desire to secure by LettersPatent- 1. The device for converting reciprocating into rotary motion,embodying the combination of a reciprocating traverse-rod carrying a boxor bearing for the crank-pin and a yoke or equivalent support for thebearings ot' the traverse-rod, substantially as set forth.

2. In a Scotch yoke for converting motion, a reciprocating box orbearing for the crankpin, provided with extensions at opposite sidesadapted to move in bearings in or upon the ends of the yoke,substantially as set forth.

3. In a yoke device for converting reciprocating into rotary motion, theyoke D, adapted to receive a reciprocating rod, 01, carrying thecrank-wrist bearing, substantially as specified.

4. In a yoke device for converting reciprocating into rotary motion, theyoke D, provided with a detachable end or head, a, in combination withthe traverse-rod d and crankwrist bearing, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

EDGAR E. MILLER.

Witnesses:

H. A. SOLIDAY, J As. A. RAYNQLDS.

